When low (audio) frequency and high (RF) frequency protection is required, use multi- point AC ground with only one DC connection. Separate grounds according to signal levels - since induced noise can affect signal only if ground loop is part of the signal circuit. Improper grounding or earthing of “Distributed Control Systems (DCS)” or “Power Electronic Systems (PES)” can result in either mal-operation of the system / controller or failure of electronic control cards or sometimes even the embedded control software getting erased. Similarly, a bad quality of. This is an old building so the client is unable to verify existing grounding. They have a copper pipe system underneath the floor (with soldered - yes soldered connections), which they use as a computer ground. They think the copper pipe system then has a conductor running out to a single test well. This manual is applicable for low voltage AC and DC drive systems. Where is Return? The electronics inside an AFCI breaker detect characteristic frequencies, usually around 100 kHz, caused by wire arcing, which are sustained for more than a few milliseconds. This section identifies common and general grounding and bonding requirements of communication installations and applies to all sections of Divisions 27 // and 28 //. Low voltage wiring: Section 27 10 00, STRUCTURED CABLING. Provide plan. of ground and bonding infrastructure as describ able with the prior written appro ec nodized BICSI/TIA/EIA/ANSI approved (4”W x 1/4” x 12”L) ground bus bar with insulators and nodized BICSI/TIA/EIA/ANSI approved (2”W x 1/4” a single barrel, mechanical s een # 6 AWG insulated bonding jum sw rth.
